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US 4,116,738 AGranted
Continuous production of tubular modular filter elements using nonwoven webs from thermoplastic fibers and products
AssigneePall Corporation
InventorDavid B. Pall
Life of this patent
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Abstract
A process is provided for the continuous production of modular tubular filter elements using nonwoven webs in cylindrical or sheet form spun from thermoplastic fibers, spinning the fibers continuously from a melt onto a rotating internal tubular core for the filter element, serving as a mandrel, and winding them up on the core to form a wound tube.
Claims20
A process for continuously forming modular tubular filter elements of thermoplastic fibrous material, said elements having a seamless, generally cylindrical configuration and having a foraminous tubular support and a desired length, comprising:
- spinning a plurality of fibers from molten thermoplastic material, collecting and winding said fibers directly onto an axially moving, rotating foraminous tubular core to form thereon a wound cylindrical layer of randomly oriented heterogeneously interwined spun fibers, said layer being of indefinite length, cutting through said layer, and detatching a severed length of filter tube and a length of core together from said indefinite length thereby forming said tubular filter element having said tubular support.
Dependencies are inferred from the claim text.